We'd like to fool ourselves into thinking that our favorite Hollywood celebs are untouchable. They seem to defy the test of time. So what could possibly bring them down? But the truth is that even rich and famous people are still only human. And it turns out that for every healthy celeb, there are celebrities' unknown diseases which fans didn't even know they were fighting.

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Sarah Hyland

The "Modern Family" star who plays Haley on the sitcom suffers from kidney dysplasia, which means a baby winds up with sacs of cysts instead of normal kidney tissue. So, when Sarah was a baby, her dad gave her one of his kidneys. Best dad ever!

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Angelina Jolie

Angeline, one of this list of celebrities' unknown diseases includes the BRCA gene mutation which causes cancer. So, Jolie underwent a double mastectomy and ovarian surgery to prevent it. She also has Bell's Palsy, which causes high blood pressure and facial paralysis.

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Selena Gomez

The singer was dealt with a double whammy when she ended up suffering kidney disease, and was later diagnosed with lupus in 2015. Lupus causes inflammation of organs like the skin, brain, heart, and kidneys. Fortunately, her friend Francia Raisa, donated a kidney.

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Halle Berry

While filming her TV show, "Living Dolls," Berry collapsed. It turns out that this was because she didn't have enough insulin, which turns sugar into energy. After being diagnosed with type 2 diabetes, she was told she'd have to keep her diet in check and inject herself with insulin.

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Nick Cannon

The former "America's Got Talent" host's kidneys started to fail in 2012, leading him to be hospitalized. Doctors diagnosed him with lupus, an autoimmune disease that causes organs to inflame. Now Nick can relate with Selena Gomez's in this list of celebrities' unknown diseases.

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Kim Kardashian

Kim K seems positively flawless on camera, in photos, and in person. But it turns out that she suffers from psoriasis, a skin disease that causes patches of irregular-looking skin. But Kim proved to be a real trooper by revealing the diagnosis on an episode of "Keeping Up With The Kardashians".

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Bret Michaels

The lead singer of the metal band, Poison, has had to battle with type 1 diabetes since he was a child. Bret knows all about the fatigue, hunger, blurred vision, and increased thirst from this disease. But he's managed to keep it under control with a good diet and healthy living.

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Montel Williams

The former talk show host learned that he had multiple sclerosis back in 1999. The disease causes the immune system to attack nerves, leading to impaired coordination, pain, and blindness. To ease the pain, Williams smokes medical grade marijuana.

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Avril Lavigne

The singer who brought us hits like "So Much For My Happy Ending," contracted Lyme disease, an infection caused by deer ticks. Aside from flu-like symptoms, Lavigne has had to endure joint pain and skin rashes. But with antibiotics, she was able to fully recover.

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Michael Douglas

Douglas, who's best known for his role in "Fatal Attraction," 1987, was diagnosed with a cancerous tumor at the base of his tongue. But with chemotherapy and radiation treatment, Douglas was cleared and tumor-free in 2011. But he claims he can no longer stand the taste of red wine.

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Hugh Jackman

The "X-Men" star has suffered from basal cell carcinoma, a form of skin cancer on his nose since 2013. Unfortunately, every time they remove it and treat it with chemo, it comes back. As of 2017, they've had to cut skin cancer out of his nose 6 times.

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Roseanne Barr

Known for her sitcom, "Roseanne," which is making a comeback in 2018, the actress suffers from macular degeneration and glaucoma. Both conditions on their own can lead to blindness, but together, the actress struggles to fight the prognosis with medical grade marijuana.

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Bono

The sensational singer from the band U2, wears glasses for one very good reason. He suffers from glaucoma, which causes damage to the optic nerve and only gets progressively worse until the person goes permanently blind. But if a pap flashes a camera, Bono admits he won't see for a while.

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Tom Hanks

The "Forrest Gump" actor has all his wits and looks great at 61, but he's also dealing with type 2 diabetes. Sadly, Hanks confessed on the Letterman Show in 2013, that his weight gain and weight losses for his film roles, might have been the cause of the diabetes.

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Rosie O'Donnell

O'Donnell has always been a barrel of laughs in movies, as a talk show host, on Twitter, and on her new show, "SMILF". But in 2012, O'Donnell needed a stent in her artery, which was almost fully blocked, and led to a heart attack. Now she seriously watches what she eats.

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Sheryl Crow

The singer had to undergo a lumpectomy after her breast cancer diagnosis. Later, she developed a meningioma, which is a benign brain tumor. She continues to see her doctor for regular follow-ups to ensure that other tumors, benign or otherwise don't pop up.

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Paula Deen

Say what you will about Paula, but she's a genius chef. But it must be frustrating to suffer from type 2 diabetes, which she learned she had 3 years ago, and cook delicious things you can't always eat. The poor thing also suffers from bouts of depression too.

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Pamela Anderson

When the "Baywatch" bombshell contracted hepatitis C, a condition that can cause scarring of the liver and cirrhosis, fans worried. Hep C is extremely difficult to treat, but in 2015, Anderson announced that she was completely cured and still looking as hot as ever.

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Shannen Doherty

The former "90210," and "Charmed" actress was diagnosed with breast cancer in 2015. But her family, and her fans were with her through thick and thin to cheer her on as she underwent a mastectomy, and chemotherapy. In 2017, she was cancer free.

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Demi Lovato

The singer who brought us hit songs like "Sorry Not Sorry," has struggled with bipolar disorder, a condition which scientists believe may be caused by altered brain chemistry, environmental factors, and genetics that lead to manic phases, and mood swings.

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Kristen Johnston

Johnston is best known as Sally from "3rd Rock From The Sun," and from TVLand's "The Exes." But many people don't know that she suffers from lupus myelitis, a rare type of lupus that causes serious inflammations in the spinal column, and can lead to paralysis.

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Toni Braxton

The singer who gifted us with the song "Un-Break My Heart" in 1996, was diagnosed with lupus, which produces painful flare ups that affect major organs like the heart and lung, as well as producing fevers and rashes. Today, Braxton does charity work to raise money to find a cure.

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T-Boz

The band member of girl group, TLC became a hit sensation in the early 90s. She even won four Grammy's. But she also learned she had sickle cell anemia, a condition that general affects African-Americans and can destroy red blood cells. Most people don't make it past 30. But she's 47, so booyah!

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Missy Elliott

The American rapper who brought us songs like "Work it" and Get Ur Freak On," suffers from Graves disease, a condition that causes the thyroid to get inflamed, leading to weight loss, puffy eyes, and hand tremors. So the singer had to learn to take things slower.

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Cher

If the Goddess of Pop could turn back time, she would go back to a point where she wasn't plagued with chronic fatigue syndrome. The condition causes pain, extreme fatigue, and sleeping problems. There's no cure, and it can go away in a few years, or last a lifetime.

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Alec Baldwin

The "30 Rock" actor, and current "Match Game" host must have been hanging around Bambie for too long because unfortunately, he contracted Lyme disease, a treatable illness spread by deer ticks. Some of the symptoms include limb weakness, join point and rashes.

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Morgan Freeman

Aside from his role in "The Shawshank Redemption," 1994, Freeman has a voice that can make a math book sound interesting. Unfortunately, he suffers from fibromyalgia, which produces horrible pain throughout the muscles in the body. There's no cure and can last for a lifetime.